Chonburi Factory Complex
Project Overview
The Challenge
This automotive parts manufacturer in Chonburi's Eastern Seaboard industrial zone operates CNC machining centers, stamping presses, and assembly lines that run two shifts daily. Electricity represents one of the factory's largest operating expenses, and with PEA tariffs rising 3–5% annually, the operations director needed a way to reduce energy costs without diverting capital from production equipment upgrades. Additionally, Tier-1 OEM customers including Toyota and Honda had begun requiring documented ESG compliance from their supply chain partners, making carbon reduction a business necessity rather than an optional initiative.
System Design & Engineering
CapSolar deployed a 1.8 MW solar PPA system across 8,500 sqm of rooftop, installing 3,100 Tier-1 monocrystalline panels. Under the PPA model, CapSolar financed, installed, and maintains the entire system at zero cost to the manufacturer. The string inverter layout matches the factory's two-shift consumption pattern, with generation peaking when CNC machines and compressed air systems draw maximum power. Panel tilt angles were optimized for Chonburi's latitude, and all rooftop penetrations were waterproofed to factory insurance specifications.
Energy Performance & Savings
The system generates 2,400 MWh of clean electricity annually. The manufacturer pays only for solar electricity consumed, at a rate 28% below the PEA grid tariff — immediate savings from day one with no upfront investment, no maintenance responsibility, and no technology risk. Because the PPA rate is fixed while grid tariffs climb, effective savings increase over time. The factory's daytime production schedule aligns naturally with solar generation, achieving self-consumption rates above 85%.
Environmental Impact
The installation reduces CO₂ emissions by 1,440 tons per year. For an automotive parts supplier, this carbon reduction directly supports compliance with the EU Carbon Border Adjustment Mechanism and Japan's Green Transformation requirements. The documented emissions data strengthens the factory's position in OEM supply chain audits, where environmental performance increasingly influences supplier selection.
Why This Project Matters
This project illustrates how solar PPA removes the two biggest barriers for manufacturing factories: upfront capital and technical risk. The zero-investment structure allowed this Chonburi automotive factory to achieve 28% electricity savings while meeting supply chain ESG mandates. For manufacturing facilities across Thailand's Eastern Seaboard facing similar cost and compliance pressures, this case demonstrates that solar PPA delivers measurable returns from the first month of operation.
